Torii Yōzō, the South Edo Magistrate, promises to recognize the legitimacy of the Bansha Aratamesho if Ogasawara and the others can recruit a man called Ryūdō Yukiatsu into the organization.

Yukiatsu helps the other Ayashi to protect Ōta from the Yōi.

The samurai residential quarters of Edo are under attack by the second Yōi. Meanwhile, Yuki must choose between a life with Ōta and Tae-san or a life as an ayashi.

The Office of Barbarian Knowledge Enforcement is investigating a series of missing persons around the circus area in Yotsuya. The South Edo Magistrate are also pursuing the same case.

Tamahei, the Okappiki, suspects that Yukiatsu might have murdered someone in Edo 15 years ago.

The serpent Yōi runs wild in Edo. Torii plans to use Atl as human sacrifice to appease the Yōi.

Yukiatsu tries to draw out the Ayagami from the serpent Yōi, but finds he is unable to do it. The only thing to do is to try to take the Ayagami from Shichi in order to subdue the Yōi. To change the serpent Yōi into a good spirit, Kumoshichi fuses himself with it.

The Office of Barbarian Knowledge Enforcement is given jurisdiction to investigate the case of missing people around the Kabuki playhouses. Saizō is adamant to investigate the case without Yukiatsu's help.

Saizō is possessed by the Mask Yōi and her dance is drawing all Yōi into Edo. Ogasawara orders his Ayashi to terminate Saizō.

After Ryūdō confronts Saizō and saves her from the Mask Yōi, Saizō manages to destroy the Yōi herself.

Ryūdō and Ogasawara travel along a highway outside Edo, slaying Yōi to make a safe path for an important official to travel through the area.